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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343e13a262c98ccd447b1c5e67e749834ef8e73f0c28a85bc681eefb0ae7641e' 
  AND token = 'U7Cag6SLPzxsUlW7gxuNNV6ZscRM46u5h3klmMwZATA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}